g. What happens to your breathing rate during exercise and why? h. When oxygen levels in the blood get too low, chemoreceptors located in the and in the carotid arteries and aorta respectively, will send impulses to the primary respiratory center, which will (increase or decrease) impulses to the respiratory muscles, which will (increase or decrease) breaths per minute. reflex protects lung tissues when taking deep breaths in by telling the primary respiratory center to stop sending motor impulses to the respiratory muscles and accessory muscles, and the bronchial tree, limiting inspiration and overexpansion of the lungs. i. What happens to blood oxygen levels? ii. What happens to blood carbon dioxide levels? iii. What happens to blood hydrogen ion levels? i. Explain Cheyne-Stokes respiration. 7. Gas Exchange (Fig. 14.10, p. 346) a. b. the exchange of respiratory gases between the alveoli in the lungs and the blood in the pulmonary capillaries. i. After you inhale, O₂ are high in the into the ww two areas of concentration for O₂ and CO₂ sets up a pressure concentration gradient for the gases to move via diffusion from concentration to concentration down their concentration gradients. ii. Therefore, O₂ will move from to ; and CO₂ will move from and low in the CO₂ concentration is higher in the and low in the ― to concentration into the . These concentration tissue fluid in the body and the blood in the systemic capillaries. i. When the left ventricle of the heart contracts, it forces blood out of the heart into the aorta and into the systemic blood vessels. This blood is -rich and is scarlet red. The ECF (tissue fluid) surrounding our tissue cells has a concentration of CO₂. Why? concentration of O₂ and a ii. Here again, we have to areas of concentration for O₂ and CO₂ and therefore a concentration gradient for the gases to move via diffusion from, concentration to gradients. iii. This means then, O₂ will move from to concentration into the and will then diffuse from to concentration into the tissue cells; and at the same time CO₂ will diffuse from and will to concentration into the then diffuse from concentration into the blood that will be routed to the lungs. to and then out of the body. -- the exchange of respiratory gases between the concentration down their concentration